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MOLLUSCA. 
Genus Clausilia. 
C. bidens, Drap., 
Is a rare and local species in Ireland. The first native specimens I have 
seen were in the collection of Mr. T. W. Warren, of Dublin, who had 
procured them in Belamont Forest, near Coothill, County Cavan. A few 
specimens obtained by Mr. Callwell, on Hare Island, in the Shannon (L. 
Pree) above Athlone. In Sept., 1837, I had the gratification of seeing 
numbers of this fine Clausilia, after heavy rain, ascending the stems of the 
stately trees in the demesne of Florence Court, County Fermanagh, the 
seat of the Earl of Enniskillen. At Dovedale, in Derbyshire, I have met 
with it. 
C. nigricans, Jeffreys, 
Is very commonly distributed over Ireland and the surrounding islands. 
It is an extremely variable species, in being more or less ventricose, in the 
striae being obscure or prominent, in the form of the mouth, and occasion- 
ally even in the number of internal lamellae — the largest specimen I have 
found in the neighbourhood of Belfast is 7^ lines in length, and has 
thirteen volutions ; several others of the usual length of 6 lines have like- 
wise this number. The colour commonly varies from a very pale greyish- 
white to deep reddish-brown ; very rarely specimens of a glassy trans- 
parency occur, and in such of these as I have found the animal was 
equally colourless. To Mr. Gray, Mr. Alder, and Mr. Forbes I have 
shown the specimens differing as here described, and they agree with me 
that they must all be considered C. nigricans. 
Family “ Auriculae.” 
Genus Carychium. 
C. minimum, Mull. 
This minute species is commonly distributed over Ireland, and may be 
found in moss, on decaying leaves and wood, under stones, &c., in dry as 
well as wet places, though the latter are its favourite abode ; in the North 
of the island specimens rarely attain one line in length. 
Genus Acme. 
A.fusca, Gray, 
Is rare in Ireland, but is widely distributed, being found over the island. 
Dr. W. H. Harvey was the first to find and distinguish this species as 
a native — he notes it as not uncommon on the sand-hills in Miltown Mal- 
bay, where in 1826 he procured both the ordinary form and the variety 
with the spires reversed. This shell has been procured by Mr. Hyndman 
and myself in various localities in the Counties of Down and Antrim, but 
not more than three or four individuals have been obtained on any one 
occasion. I have more than once found this shell, containing the living 
animal, under stones on bare clayey banks, in which situations the only 
other mollusc met with was Helix crystallina. At Annahoe (County Ty- 
rone) Mr. Edw. Waller has obtained the A.fusca (both a. and b. Turton, 
p. 83) ; as Mr. T. W. Warren has done in the neighbourhood of Dublin, 
and the Rev. B. J. Clarke at La Bergerie, Queen’s County. The Rev. T. 
Hincks of Cork favours me with two southern habitats— Ballinhassig 
Glen (County Cork) and near Mucruss, Killarney (County Kerry). 
